Porous Graphene: Microwave Combustion for Rapidly Synthesizing Pore‐Size‐Controllable Porous Graphene (Adv. Funct. Mater. 22/2018)

Wan, Jun; Huang, Liang; Wu, Jiabin; Xiong, Lingyun; Hu, Zhimi; Yu, Huimin; Li, Tianqi; Zhou, Jun

doi:10.1002/adfm.201870154

Cited by 10 publications

(19 citation statements)

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“…According to the X‐ray photoelectron spectroscopy (XPS) analysis (Figure S7c, Supporting Information), the high‐resolution Ag 3d spectrum for WC@Ag samples could be deconvoluted into two peaks at 368.46 and 374.47 eV, which correspond to binding energies of 3d 3/2 and 3d 5/2 for metallic Ag, respectively (Figure S7d, Supporting Information). [ 14 ] Moreover, nitrogen adsorption/desorption isotherms of as‐prepared samples display similar type‐IV curves with apparent H1‐type hysteresis loop (0.45 ≤ P / P 0 ≤ 1.0), supporting the existence of micropores and mesopores (Figure S7e, Supporting Information). As listed in Table S1, Supporting Information, the WC@Ag (363–586 m 2 g −1 ) possesses smaller specific surface area than WC (600 m 2 g −1 ) because Ag nanoparticles, with high atomic mass, are uncapable of contributing to specific surface area.…”

Section: Resultsmentioning

confidence: 61%

“…As revealed in Figure 1g, we could find two well‐resolved lattice fringes in the nanoparticle with the interplanar spacings of 0.237 and 0.201 nm, discernible from TEM and high‐resolution TEM (HR‐TEM) images, which can be indexed to (110) and (200) planes of Ag, respectively. [ 14 ] Of note, the selected area electron diffraction (SAED) pattern exhibits three concentric rings ascribed to (111), (200), and (311) planes, indicating the high surface activity of Ag nanoparticles. [ 15 ] As presented in Figure S6, Supporting Information, the resistance value for the WC@Ag monolith is much lower than that for WC, suggesting an enhanced conductivity for WC@Ag.…”

Section: Resultsmentioning

confidence: 99%

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Wood‐Derived, Conductivity and Hierarchical Pore Integrated Thick Electrode Enabling High Areal/Volumetric Energy Density for Hybrid Capacitors

Wang

Liu

Duan

et al. 2021

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For the proliferation of the supercapacitor technology, it is essential to attain superior areal and volumetric performance. Nevertheless, maintaining stable areal/volumetric capacitance and rate capability, especially for thick electrodes, remains a fundamental challenge. Here, for the first time, a rationally designed porous monolithic electrode is reported with high thickness of 800 µm (46.74 mg cm−2, with high areal mass loading of NiCo2S4 6.9 mg cm−2) in which redox‐active Ag nanoparticles and NiCo2S4 nanosheets are sequentially decorated on highly conductive wood‐derived carbon (WC) substrates. The hierarchically assembled WC@Ag@NiCo2S4 electrode exhibits outstanding areal capacitance of 6.09 F cm−2 and long‐term stability of 84.5% up to 10 000 cycles, as well as exceptional rate capability at 50 mA cm−2. The asymmetric cell with an anode of WC@Ag and a cathode of WC@Ag@NiCo2S4 delivers areal/volumetric energy density of 0.59 mWh cm−2/3.93 mWh cm−3, which is much‐improved performance compared to those of most reported thick electrodes at the same scale. Theoretical calculations verify that the enhanced performance could be attributed to the decreased adsorption energy of OH− and the down‐shifted d‐band of Ag atoms, which can accelerate the electron transport and ion transfer.

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Section: Resultsmentioning

confidence: 61%

Section: Resultsmentioning

confidence: 99%

Wood‐Derived, Conductivity and Hierarchical Pore Integrated Thick Electrode Enabling High Areal/Volumetric Energy Density for Hybrid Capacitors

Wang

Liu

Duan

et al. 2021

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“…The pursuit of 2D materials derives from their excellent optical, electrical, magnetic, and structural properties. [ 1–6 ] First, the ultrathin thickness of 2D materials greatly increases their specific surface area (SSA) and promotes atom utilization. The band structure and electrical characteristics of 2D materials can be adjusted by controlling their thickness or using doping approaches.…”

Section: Introductionmentioning

confidence: 99%

Salt‐Assisted Synthesis of 2D Materials

Huang

Jin

et al. 2020

Adv Funct Materials

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133

112

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2D materials have demonstrated good chemical, optical, electrical, and magnetic characteristics, and offer great potential in numerous applications. Corresponding synthesis technologies of 2D materials that are highquality, high-yield, low-cost, and time-saving are highly desired. Salt-assisted methods are emerging technologies that can meet these requirements for the fabrication of 2D materials. Herein, the recent process for the salt-assisted synthesis of 2D materials and their typical applications are summarized. First, the properties of salt crystals and molten salts are briefly introduced, and then some examples of 2D materials synthesis with the assistance of salt as well as their representative applications are presented. The underlying mechanisms of salts with different states on the formation of 2D morphology are discussed to aid in the rational design of synthetic route of 2D materials. At last, the challenges and future perspectives for salt-assisted methods are briefly described. This review provides guidance for the controllable synthesis of 2D materials based on the salt-assisted approaches.The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/adfm.201908486.MoO 3 , and LaNb 2 O 7 ), [14][15][16] layered double hydroxides (LDHs, e.g., Mg 6 Al 2 (OH) 16 CO 3 •4H 2 O), [17] hexagonal-boron nitride (h-BN), [2,18] transition metal halides (such as MoCl 2 and CrCl 3 ), [19] black phosphorus, [20] graphitic carbon nitride (g-C 3 N 4 ), [5] MXene (such as Ti 2 C and Ti 3 CN), [21][22][23][24][25] and clays (for instance, [(Mg 3 )(Si 2 O 5 ) 2 (OH) 2 ] and [(Al 2 )(Si 3 Al) O 10 (OH) 2 ]K). [19] Notably, many nonlayered structure species can also form 2D morphology with specific synthetic methods, largely expanding the 2D family (such as hexagonal-MoO 3 (h-MoO 3 ), hexagonal-WO 3 (h-WO 3 ), [15] transition metal nitrides (TMNs), [26,27] and transition metal phosphides (TMPs)). [28] To exploit the applications of 2D materials, the development of a synthetic method should be prioritized. Currently, synthesis processes of 2D materials could be divided into two categories, naming the top-down and bottom-up approaches. [29][30][31] Generally, exfoliation is the most common top-down method to produce monolayer or few-layer 2D materials. [19,32] Graphene was first prepared by mechanical exfoliation of highly oriented pyrolytic graphite with sellotape in 2004. [33] The exfoliation can weaken the interlayer Van der Waals force for bulk materials with layered crystal structures while maintain the covalent bonding in plane to produce monolayer or few-layer nanosheets. Although the productivity based on this method is limited due to the low efficiency, the exfoliation approach provides a new synthesis methodology for 2D materials. A series of studies on liquid exfoliation have been conducted by Coleman and co-workers. [19,34,35] By sonicating the bulk material in an appropriate solvent with similar interface energy, 2D material ink can be prepared. After the liq...

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“…Particularly, as ammonia carriers for the automotive SCR system, the porosity, pore size, SrCl 2 loading, and the volumetric efficiency can be tailored by the processing parameters such as suspension concentration, freezing rate, and shape of the molds, to obtain porous structured SrCl 2 ‐rGO composites with a hierarchy of pores for efficient ammonia delivery while fitting to the automotive components without modifications, such as dosing pipelines, shape, and size of the storage cartridges. [ 38,47–49 ] Furthermore, the porous SrCl 2 ‐rGO composite structures exhibit a wide SrCl 2 loading range from 0 to 96 wt% with a theoretical porosity over 90%, which compensates for the volume swing associated with the ammonia absorption–desorption cycles. A series of porous SrCl 2 ‐rGO composites with SrCl 2 loading of 20, 50, 80, and 96 wt% (denoted as PS20, PS50, PS80, and PS96, respectively) as well as the SrCl 2 pellet (denoted as SP100) were designed and fabricated for comparison.…”

Section: Resultsmentioning

confidence: 99%

Porous Strontium Chloride Scaffolded by Graphene Networks as Ammonia Carriers

Cao

Akhtar

2021

Adv Funct Materials

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Strontium chloride (SrCl 2 ) as ammonia (NH 3 ) carriers has been widely exploited due to its high ammonia uptake capacity and low energy penalty for ammonia release. However, the dramatic volume swing during absorption-desorption cycles, from SrCl 2 to Sr(NH 3 ) 8 Cl 2 to SrCl 2 , imposes a challenge to structure SrCl 2 for ammonia storage applications. Herein, a novel porous SrCl 2 structure with SrCl 2 loading up to 96 wt%, scaffolded by reduced graphene oxide (rGO) networks is reported. The optimized porous SrCl 2 -rGO composite with 80 wt% SrCl 2 loading maintains the macro-and micro-structure accommodating the volume swing during ammonia absorption-desorption cycles without disintegration, whereas structured SrCl 2 pellets disintegrates directly after the first cycle of NH 3 absorption. The structured porous 80 wt% SrCl 2 -rGO composite demonstrates rapid absorption-desorption kinetics, 140% faster in absorption and 540% faster in desorption compared with pure SrCl 2 pellet. The enhancement of the surface area and the presence of SrCl 2 particles in the pores of rGO networks result in a robust and stable structure offering rapid ammonia absorption-desorption kinetics while countermining the volume swing by self-adjusting "breathing."

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Porous Graphene: Microwave Combustion for Rapidly Synthesizing Pore‐Size‐Controllable Porous Graphene (Adv. Funct. Mater. 22/2018)

Cited by 10 publications

References 0 publications

Wood‐Derived, Conductivity and Hierarchical Pore Integrated Thick Electrode Enabling High Areal/Volumetric Energy Density for Hybrid Capacitors

Wood‐Derived, Conductivity and Hierarchical Pore Integrated Thick Electrode Enabling High Areal/Volumetric Energy Density for Hybrid Capacitors

Salt‐Assisted Synthesis of 2D Materials

Porous Strontium Chloride Scaffolded by Graphene Networks as Ammonia Carriers

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